Cap for tire valves



e. F. POWELL.

CAP FOR Tl-RE VALVES.

APPLICATION FlL'ED MAY26,192L

1,4=1 3,775. w e Apr- 25, 1922.

Inventor.

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GEORGE FREDERICK POE/YELL, 0F TORDNTO, ONTARIO, CANAIDA, JASSIGN'OR OF Q1\TE THIRD TO F. DALBYMPLESCORE, OE TORONTO, ONTARIO, CANADA.

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Specificationof Iettersfatent. .Patehted 1922;

Application filed May 26, 1921. Serial No. 472,828.

To all whom it may concern:

Be it known that I, Gnoncn FREDERICK POWELL, a ubject of the King of Great Brittain, and resident of the city of Toronto, county of York, Province of Ontario, in the Dominion of Canada, have invented certain new and useful Improvements in Caps for Tire Valves, described in the following specification and illustrated in the accompanying drawings, that form part of the same.

The principal objects of the invention are to eliminate the disagreeable features incidental to the placing and removal of the ordinary dust caps on automobile tire valves and to provide a form of cap which may be very quickly attached and will form an effective protection to' the threaded stem of .the valve, automatically adjusting itself to various lengths.

The principal feature of the invention consists in the novel construction of a telescopic member adapted to encircle the valve stem and the cap for closing the end of the valve stem, whereby a cap is rotatably secured to the telescopic casing and a turning member projects beyond the telescopic member.

In the drawings, Figure 1 is an elevational view of my improved dust cap.

Figure 2 is a vertical sectional view through my improved cap shown attached to a valve. V

The labour and inconvenience of removing the ordinary threaded dust cap from automobile tire valves is extremely disagreecorroded and are hard to remove. a there is a danger of cross threading which able. Frequently thev caps become stuck or Further,

renders the placing of the valve very an- I noying, also it frequently occurs in buying a new tube that a different length of valve will result in the dust cap not properly covering the portion protruding.

In order to overcome these difliculties, I have devised a telescopic casing to encircle the valve stem which consists of a tubular member 1 formed of thin tubing preferably having a flaring mouth 2. The opposite end is formed with a short flange3. A second- 1 ary tube a of slightly larger diameter than flange 3 and after it is placed thereover the edge 5 is swaged inwardly to engage the he tube 1 is adapted toslide freely over the outer surface of the tube 1 in sliding contact.

The head end 6 of the member 4 is swaged inwardly to close around the narrow neck portion 7 of the valve cap 8 which is threaded to fit the upper threaded end 9 of the valve and a stem 10 of larger diameter than the narrow neck portion 7 engages the outer.

surface of the end flange of the member 4. The cap i thus rotatab-ly mounted in the upper sleeve & so that it cannot be removed or lost. I

The stem 10 is provided with a knurled portion adapted to be operated between the thumb and forefinger to rotate the cap and thread it upon the end of the valve stem.

Within the closed tubular member 4 is aras the length of'the valve stem projecting beyond. the rim of the wheel, varies, the member 1 will telescope into the member 4 against the spring 11 but the member 1 will always fit snugly down against the rim or into the rim nut 12 threaded on the valve.

A valve cap such as described is extremely simple and is cheap. to manufacture and being all in one piece it will obviate the an-' noyance and inconvenience of the small valve cap being lost. The one operation sufiicesto f seal and cover in the valve, that is, the telescope member is slipped overithe valve and being manipulated by the knurled stem. 10', the valve cap is screwed on to the tip of v thevalve and therv'alve is then completely enclosed. y What I claim as my invention is 1. A cap for tire valves, comprising, a

telescopic member and a threaded cap rotatably supported within said telescopic member and having a rlgid-extension proecting through SQ/1d member.

2. A cap for tire valves,.comprising, a

pair of tubular members telescoped, and a valve cap having a narrow neck portion intermediate of its length arranged partly within one of the tubular members which is formed with a flange swaged into andlooselyencircling the narrow neck portion.

3. A cap for tire valves, comprising, a

valve cap threaded to fit the reduced upper end ofa valve and having a'stem projecting centrally from the top thereof, said stem having a reduced narrow neck portion at the top of the cap, a tubular cap loosely encircling said valve cap having an inturned flanged head extending into the groove formed by the narrow neck portion, a secondary tubular member of a lesser external diameter than the internal diameter of the aforesaid tubular member and having its,

inner end flanged outwardly to slidably engage the inner Wall of the larger member, the larger member having its outer end swaged inwardly to engage the outer Wall of the smaller member, said smaller memher having a flarin e g ml GEORGE FREDERICK POWELL. 

